Economic potential of potassic feldspar-rich gneisses in Tysfjord-Hamaroy, Northern Norway

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Authors:Karlsen, Tor Arne
Author Affiliations:Primary:
Geological Survey of Norway, Trondheim, Norway
Volume Title:Industrial minerals and rocks in Norway
Volume Authors:Cook, Nigel J., editor; Karlsen, Tor Arne; Roberts, David
Source:Industrial minerals and rocks in Norway, edited by Nigel J. Cook, Tor Arne Karlsen and David Roberts. Bulletin - Norges Geologiske Undersokelse, Vol.436, p.129-135. Publisher: Universitetsforlaget, Trondheim - Oslo, Norway. ISSN: 0332-5768
Publication Date:2000
Note:In English. 9 refs.; illus., incl. 4 tables, geol. sketch maps
Summary:Potassic feldspar gneiss in the Tysfjord/Hamaroy area may be a potential resource for future exploitation. The rock consists primarily of microcline (up to 84%) and quartz (up to 35%), together with small amounts of plagioclase (1-12%), commonly albite. Accessory minerals include epidote, micas and magnetite. Six deposits have been indicated by mapping. All are situated within a supracrustal suite of Precambrian age (2500-2100 Ma) dominated by a feldspathic gneiss. The quality of the rock is largely dependent on the texture and grain size, as a fine grain size and complex grain boundaries make separation of the different minerals difficult.
Sections:Economic minerals and ore deposits
Subsections:Non-metallic deposits
Subjects:Alkali feldspar; Basement; Feldspar deposits; Feldspar group; Framework silicates; Gneisses; Host rocks; Industrial minerals; K-feldspar; Metamorphic rocks; Mineral composition; Mineral exploration; Petrography; Precambrian; Silicates; Tectonics; Textures; Europe; Lofoten Islands; Narvik Norway; Nordland Norway; Northern Norway; Norway; Scandinavia; Western Europe; Hamaroy Norway; Tysfjord Norway
Coordinates:N682600 N682600 E0172500 E0172500
Abstract Numbers:02M/2628
Record ID:2008106280
Copyright Information:GeoRef, Copyright 2020 American Geosciences Institute.
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